US3566237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for regulating the mean current flow in a load
Assignee: ZF International UK Ltd
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Filing: 1968-09-11
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Granted: 1971-02-23
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Expires: 1988-09-11
Abstract
Abstract A control circuit particularly designed for regulating the mean current flow in a traction motor, but usable for other purposes, includes a switching device in circuit with the load. The switching device is turned on and off, and current sensing means is provided operable when the device is in one condition, either on or off, to sense the current flow in the load and turn the switching means to its opposite state when the current has a predetermined magnitude. Timing means is then provided for determining how long the switching device remains in the switched state.
Inventors
- 👤 John Howard Moore
- 👤 Derek Stanley Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/921
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A control circuit for regulating the mean current flow in a load, comprising a switching device in circuit with the load, the switching device having an on condition and an off condition, switching means for turning the device on and off, current sensing means operable when the device is in one condition to sense the current flow in the load and control the switching means to drive the device to its other condition when the current has a predetermined magnitude, and timing means for maintaining the switching means in said other condition for a length of time which varies inversely with the time for which said switching device was in said one condition so as to determine the maximum operating frequency of the control circuit.
Claim 2
Dependent Claim
125 words
A control circuit for regulating the mean current flow in a load, comprising a switching device in circuit with the load, the switching device having an on condition and an off condition, switching means for turning the device on and off, current sensing means operable when the device is in one condition to sense the current flow in the load and control the switching means to drive the device to its other condition when the current has a predetermined magnitude, and timing means for maintaining the switching means in said other condition for a length of time which varies inversely with the time for which said switching device was in said one condition so as to determine the maximum operating frequency of the control circuit.
Claim 3
Dependent Claim
20 words
A circuit as claimed in claim 1 in which said one condition is the on condition of the switching device.
Claim 4
Dependent Claim
20 words
A circuit as claimed in claim 1 in which said one condition is the off condition of the switching device.
Claim 5
Dependent Claim
15 words
A circuit as claimed in claim 1 in which said maximum operating frequency is variable.
Claim 6
Dependent Claim
30 words
A circuit as claimed in claim 1 in which the load is the traction motor of a vehicle having a throttle pedal the position of which determines said predetermined magnitude.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |